void main() {
  flutterSkills();
}

void flutterSkills() {
  List? list;
  bool? isOpen;
  print(list?.length);
  if (isOpen ?? false) {
    print('is open');
  }
  list = [];
  list.add(0);
  list.add("");
  list.add(null);
  if ([null, "", 0].contains(list[0])) {
    print('list[0] is null, "", 0');
  }
  // print('flutter skills');
}
